19
7
7
6
6
6
6
5
5
5
7
5
4
4
4
4
4
4
4
4
5
5
5
5
6
6
6
6
6
6
6
6
5
5
3
3
3
3
3
3
3
3
3
7
7
7
5
4
5
2
1
2
2
3
4
7
5
6
6
2
2
3
3
3
3
3
3
2
3
3
4
4
Moist (A)
Mar
ine (C)
Dr
y (B)
Wa
rm-Humid
Belo
w
White Line
NO
TE
:
Zone 7 includes all of Alaska e
xcept f
or the f
ollo
wing
burroughs in Zone 8:
Bethel, Nor
thwest Arcti
c,
Dellingham,
Southeast
Fa
irbanks
, N.
Star
, W
ade Hampton, Nome
,
Yu
kon-K
oyukuk, Nor
th Slope
.
NO
TE:
Zone 1 includes
Ha
w
aii, Guam, Puer
to Rico
,
and the
Virgin Islands
Figure 9. climate Map
IE
cc
z
on
E
s
Ear
th
l
oo
P
sI
z
E
(
F
t/t
on)
1, 2, 3A, 3B
100
3C, 4A, 4B
80
4C, 5, 6, 7, 8
65
There are exceptions to the earth loop sizes shown in this table. Within a climate zone, the weather, and underground conditions vary from place to place. The earth loop length may need to be adjusted accordingly.
Earth loop size indicated in the table assumes installation within bedrock
or permanently water saturated ground.
